Begin by washing your zucchinis thoroughly. Using a mandoline slicer or a sharp knife, slice each zucchini lengthwise into thin strips approximately 1/8 inch thick. Sprinkle the strips with salt and lay them on paper towels or a clean kitchen towel. Let them sit for about 15 minutes, then gently pat them dry to remove any released water.
Heat a tablespoon of olive oil in a large skillet over medium heat. Add the chopped onion and sauté until translucent, about 3 minutes. Stir in the minced garlic and diced bell pepper, cooking for another 2-3 minutes until fragrant and softened.
Add the ground turkey to the skillet, breaking it apart with a spoon. Cook until browned and no longer pink, about 6-8 minutes. Season with salt, pepper, dried oregano, and basil. Once the turkey is cooked through, pour in the marinara sauce. Stir to combine and let simmer on low heat for 10 minutes to allow the flavors to meld.
Preheat your oven to 375°F (190°C). In a 9x13 inch baking dish, spread a thin layer of the turkey marinara mixture on the bottom to prevent sticking.
Start layering your No-Noodle Zucchini Lasagna by placing a layer of zucchini strips evenly over the sauce. Dollop spoonfuls of ricotta cheese over the zucchini, then sprinkle a layer of shredded mozzarella and a bit of Parmesan. Repeat the layering process: sauce, zucchini strips, ricotta, mozzarella, and Parmesan until all ingredients are used, finishing with a generous topping of mozzarella and Parmesan cheese.
Cover the baking dish with aluminum foil and bake in the preheated oven for 30 minutes. After 30 minutes, remove the foil and bake for an additional 10-15 minutes, or until the cheese on top is bubbly and golden brown.
Let the lasagna cool for 10 minutes before slicing and serving. This resting time helps the layers set, making it easier to cut neat portions.